If someone wants to test this... it "should" remove the stock bookmarks. It MAY reset you Sense setup so you might need to restore it after. I can't test this because I delete those bookmarks from my ROM. That said PROCEED WITH CAUTION until someone test it. Who wants to be the Guinea pig? Should work fine.
Tested and it DID NOT reset Sense. Checked my bookmarks and I only had google dot com. That is the one I left behind. It looks like it worked like it should.
Since this did appear to work I removed it. You would probably need to add that in before flashing the ROM.